EP0357386A2
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Image encoding apparatus
Assignee: Canon Inc
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Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract An image encoding apparatus includes a smoothing circuit (11) for smoothing a binary image to be encoded, a binary-encoding circuit (12) for binary-encoding the image smoothed by the smoothing circuit, a sampling circuit (13) for sub-sampling the image binary-encoded by the binary-encoding circuit, and an encoding circuit (26) for encoding the binary image sub-sampled by the sampling circuit. A degree of smoothness (G) of an image by the smoothing circuit and a threshold value (T₁) for a binary-encoding operation of the binary-encoding circuit can be varied.
Inventors
- 👤 Shigeo Kato
- 👤 Yasuhiko Yasuda
- 👤 Hidefumi Ohsawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 15:53
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4007; H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/417; H04N1/4172
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
An image encoding apparatus comprising: smoothing means for smoothing a binary image to be encoded; binary-encoding means for binary-encoding the image smoothed by said smoothing means; sampling means for sub-sampling the image binary-encoded by said binary-encoding means; and encoding means for encoding the binary image sub-sampled by said sampling means, wherein a degree of smoothness of an image by said smoothing means and a threshold value for a binary-encoding operation of said binary-encoding means can be varied.
Claim 2
Dependent Claim
77 words
An image encoding apparatus comprising: smoothing means for smoothing a binary image to be encoded; binary-encoding means for binary-encoding the image smoothed by said smoothing means; sampling means for sub-sampling the image binary-encoded by said binary-encoding means; and encoding means for encoding the binary image sub-sampled by said sampling means, wherein a degree of smoothness of an image by said smoothing means and a threshold value for a binary-encoding operation of said binary-encoding means can be varied.
Claim 3
Dependent Claim
18 words
An apparatus according to claim 1, wherein said smoothing means smoothes a pixel of interest using surrounding pixels.
Claim 4
Dependent Claim
32 words
An apparatus according to claim 1, wherein the threshold value for the binary-encoding operation of said binary-encoding means changes in accordance with a change in degree of smoothness of said smoothing means.
Claim 5
Dependent Claim
148 words
An image encoding apparatus comprising: first smoothing means for smoothing a binary image to be encoded; first binary-encoding means for binary-encoding the image smoothed by said first smoothing means; first sampling means for sub-sampling the image binary-encoded by said first binary-encoding means to form an image having a first resolution; second smoothing means for smoothing the binary image sub-sampled by said first sampling means; second sampling means for sub-sampling the image binary-encoded by said second binary-encoding means to form an image having a second resolution; and encoding means for encoding the images having the first and second resolutions sub-sampled by said first and second sampling means, respectively, wherein a degree of smoothness of said first smoothing means is different from that of said second smoothing means, and a threshold value for a binary-encoding operation of said first binary-encoding means is different from that of said second binary-encoding means.
Claim 6
Dependent Claim
148 words
An image encoding apparatus comprising: first smoothing means for smoothing a binary image to be encoded; first binary-encoding means for binary-encoding the image smoothed by said first smoothing means; first sampling means for sub-sampling the image binary-encoded by said first binary-encoding means to form an image having a first resolution; second smoothing means for smoothing the binary image sub-sampled by said first sampling means; second sampling means for sub-sampling the image binary-encoded by said second binary-encoding means to form an image having a second resolution; and encoding means for encoding the images having the first and second resolutions sub-sampled by said first and second sampling means, respectively, wherein a degree of smoothness of said first smoothing means is different from that of said second smoothing means, and a threshold value for a binary-encoding operation of said first binary-encoding means is different from that of said second binary-encoding means.
Claim 7
Dependent Claim
21 words
An apparatus according to claim 4, wherein said first and second smoothing means smooth a pixel of interest using surrounding pixels.
Claim 8
Dependent Claim
21 words
An apparatus according to claim 4, wherein the degrees of smoothness of said first and second smoothing means can be varied.
Claim 9
Dependent Claim
35 words
An apparatus according to claim 6, wherein the threshold values of said first and second binary-encoding means change in accordance with a change in degree of smoothness of said first and second smoothing means, respectively.
References Cited (Backward Citations)
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